A compass near a steel cabinet points north-east. The same compass in an open area points approximately north. It returns to each direction when disturbed. Which conclusion is best supported?
A local magnetic influence changes the indoor reading; the outdoor reading follows Earth’s field.
A local gravitational influence changes the indoor reading; the outdoor reading follows Earth’s field.
A local magnetic influence changes the indoor reading; the outdoor reading follows Earth’s gravity.
A local gravitational influence changes the indoor reading; the outdoor reading follows Earth’s gravity.